As far as I know this is the first time that Syma hosts a figure skating event.
I've been to Syma once. It was also in January and it was pleasantly warm inside. But it was an exhibition about higher educational institutions which is obviously not the same.
Syma has three halls. The EC will be held in the biggest one, which is hall A. This is where you can see the layout of Syma:http://www.syma.hu/alaprajz.php?lang=en. And here you can find information on the size of the halls: http://www.syma.hu/muszaki.php?lang=en.
I hope this helps a bit.